The biosphere is the most inclusive level of biological organization, encompassing all ecosystems on Earth. It includes the interactions between living organisms and their physical environment on a global scale.
domain
The United Nations is the international organization that is the most inclusive, has the most members, and has as a primary goal the maintenance of international peace and security.
domain
Species.
The most inclusive level of life is the domain, which includes all living organisms on Earth. This level encompasses all organisms and includes the highest level of classification in the Linnaean taxonomy system.
The sequence that exhibits an increasing-most inclusive scheme of classification is: species, genus, family, order, class, phylum, kingdom, domain. This sequence starts at the smallest taxonomic level (species) and progresses to the largest and most inclusive level (domain).
The cell which is the basic unit of life
A cell.
The simplest level of organization as far as taxonomy goes would be the most inclusive one; a domain. If you are asking in terms of things such as organisms, it would be the smallest, the cell.
"Cell" From unicellular to colonial and than filamentous forms
The highest and most complex level in an organization chart is typically the executive level, which includes positions such as CEO, COO, and CFO. These executives are responsible for setting the overall direction and strategy of the organization.